An evacuation in St. Lucas in northeast Iowa is over after a chemical spill.

KGAN-TV in Cedar Rapids (http://bit.ly/HsZ7qM ) says the evacuation ended Friday afternoon after authorities contained two anhydrous ammonia tanks that broke loose from the truck that was towing them. The tanks overturned around 11:30 a.m. in a downtown parking lot and a valve broke, releasing the fertilizer.

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Fayette County Sheriff Marty Fisher says one tank was up-righted and sealed. The second tank was hauled to another location and sealed.

Because St. Lucas sits in a valley, it was feared that the heavier-than-air ammonia would settle in the town of 140 people, so downtown and part of the northwest portions were evacuated.